Poke Yoke Gage Calibration - Do you have them in your calibration system?

V

VickiD

#1
:frust: Does anyone deal with poke-a- yoke gauges. Do you have them in your calibration system? We have done both and I am to the point of just putting my masters in the calibration system. Some of our poke a yoke gages are not accessible, which in turn cannot be pulled into our lab to be calibrated. I don't want to get dinged by our QS auditor by not putting them in the system, so I'm thinking if I have the master calibrated and we put the master thru the poke -a- yoke then this should be good to go? Anyone with feedback would be greatly appreciated.
 
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Jerry Eldred

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#2
I must admit I am not familiar with "Poka-A-Yoke" gauges. Using intuitive guessing, I'm assuming these may be installed reference items installed in-situ in your manufacturing process.

If you have a reference that is not calibrated, yet you indirectly verify it by running a gold standard through the process, as long as you can account for the derived accuracy (putting it very simply), you should be okay.

That said, what I mean is that the bottom line is that needed accuracy required for your product to meet its specs must be met. If your product has a given tolerance, and rather than pull out references, you compare them in-situ, you need to know that the combination of the uncertainty of your master reference, and the resolution/stability of the metering in the process must be adequate to verify that the in-situ reference meets adequate accuracy.

I've sounded a little redundant (probably because its Monday morning after a long holiday). But hopefully I have added some worthwhile input.
 
B

Bigfoot

#3
Poka Yoke Gauges

VickiD said:
:frust: Does anyone deal with poke-a- yoke gauges. Do you have them in your calibration system? We have done both and I am to the point of just putting my masters in the calibration system. Some of our poke a yoke gages are not accessible, which in turn cannot be pulled into our lab to be calibrated. I don't want to get dinged by our QS auditor by not putting them in the system, so I'm thinking if I have the master calibrated and we put the master thru the poke -a- yoke then this should be good to go? Anyone with feedback would be greatly appreciated.
Could you describe a little bit better the Gauges? What is it that your Poka Yoke is checking?

We use Poka Yoke techniques to monitor detection devices that are in place to prevent further processing of a part, by running a part of the known deficiency. The Poka Yoke "rabbit" is run through the process to verify the detection Poka Yoke is working as intended. If not we revert to the last good check and verify all product from that point forward. These parts are entered into our calibration system as "reference" parts that serve only to confirm the system check / verification as intended. They are not "Master" parts. Kind of similar to the difference between do you calibrate your gauges, or do you verify they are in calibration? Hope this helps a little.
 
V

VickiD

#4
gauges

Our poke a yokes more are less are used to check for missing holes, missing grooves, to short, to long, missing threads. So we have a master part (which I'm guessing I need to change to reference only gage) to put through machine. So a reference part would be a part with say no hole that should have a hole. When that part is run through it has to go through a poke ayoke prior to being machined, if it detects no hole the machine is shut down.
 
B

Bigfoot

#5
Reference parts

IMO: You are on the right track. To clarify my earlier post;

Reference part is a casting with the known defect that I am trying to detect for (ie: Good part has four machined scallops - Reference part has missing scallops). All it needs to do is verify the detection device is working by not allowing it to continue through the process.
 
B

Bill Ryan - 2007

#6
Bigfoot said:
IMO: You are on the right track. To clarify my earlier post;

Reference part is a casting with the known defect that I am trying to detect for (ie: Good part has four machined scallops - Reference part has missing scallops). All it needs to do is verify the detection device is working by not allowing it to continue through the process.
Basically, that's what we do also. Now, however, we are getting into the "cosmetic" types - looking for sizeable porosity, nonfills, drags/shearing, etc. I'm not sure we are covering ourselves with these types of "master castings" though. I have contacted some of the manufacturers for their recommendations. I'll let everyone know what I hear.

Bill
 
T

Timmer

#7
With our Poke-a-Yoke checking fixtures, mostly consisting of proximatey switches, we do the following. We build "Red Masters" each that have the item to be checked missing. Say our part has 3 studs protruding from a flange, and 3 proximately switches, one for each stud as well. Well 3 seperate parts are built each with a different stud missing. These Red Masters are run through the line at intervals on each shift to check to see if the Poke a Yoke fixture is working. We replace these Red Masters either every 3 months or when new ECL's are requested for the components. FYI we call tehm Red Masters becasuse they are spray painted red as to not ship them with good parts!
 

gpainter

Quite Involved in Discussions
#8
We did at my old place of employment. We had them on our calibration schedule and verified what they were checking were still in line. Many times these took a lot of abuse and tended to get damaged and not be able to give that quick check.
 
L

lday38

#9
Poke yoke record

My company has recently embarked on using a proximety switch that shuts down the machine when a defectis made. I am wondering shoud'nt there be an officical record on the machine. I have made a checklist where a sample fo a defective part is run thru the machine to make sure the poke yoke is still working.

In another poke yoke, cameras are checking the parts 100% for visual and several dimensional defects, again the defects are passed down the chute to make sure the cameras are still effective at the start of the shift. However, there are several diifernat parts with several differnat type of defects-it's beginning to get more complicated- I started with a table with the part number and defects list down the left side in a work instruction. I think this needs to be poke yoke. No one opens the book where the work instruction is, the defetcive samples are colored red and bag labeled for the partuicular part run.
 
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